A friend of mine in Ohio works on the Franklin County Sheriff helicopters who have the thermal imaging scanners on their copters.
He told me that the only thing that can absolutely block out the heat is thick concrete.
Mylar, insulation, and whatever else your thinking of trying to reflect the heat back down won't work. It will actually show up even more on their scanners.
If the Sheriff's fly over your house and pick up an image that looks to be an excessive amount of heat coming in one area, It raises suspicion, and suspicion is all it takes to start an investigation.
The sheriff's will see the heat image, then find out who lives there. Then find out if you have any kind of criminal record. They might even look through your garbage, credit records, or even follow you to get enough evidence to get a warrant.
A heat image cannot get a warrant, it starts the process of an investigation.
From what I've been told by ex-cops. The best place to put a grow room is in a basement as close to furnace as possible.
When the copters fly over the houses there should only be one heat image showing up......your furnace. If there are mutiple heat spots on your house, then it raises suspicion. Suspicion is what you want to avoid at all costs.
Also a copter thermal imaging scanner can see through the roof. and all the floors leading down to the basement. For every floor it goes through, the image gets weaker and weaker.
